The U.N. suggests that adding 2.5 billion acres of forest to the world could limit global warming to 1.5 degrees Celsius by 2050. But some researchers aren’t so sure.

Its new 1.6-gigawatt solar and wind portfolio represents almost as much capacity as all of last year’s corporate deals, combined.

While Microsoft, Facebook, Amazon and Google are progressive on some fronts, their overall corporate strategies to avert climate change have sketchy.